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3 years ago

Please please please help

Mathematics

1 answer:

Brums [2.3K]3 years ago

6 0

Ok what’s your question?

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A random variable X has a Poisson distribution with a mean of 3. What is the probability that X P(1≤X≤3) ?.

frosja888 [35]

Answer:

P(1≤X≤3) = 0.5974

Step-by-step explanation:

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

$P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}$

In which

x is the number of sucesses

e = 2.71828 is the Euler number

$\mu$ is the mean in the given interval.

Mean of 3

This means that $\mu = 3$

P(1≤X≤3) ?

$P(1 \leq X \leq 3) = P(X = 1) + P(X = 2) + P(X = 3)$

$P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}$

$P(X = 1) = \frac{e^{-3}*3^{1}}{(1)!} = 0.1494$

$P(X = 2) = \frac{e^{-3}*3^{2}}{(2)!} = 0.2240$

$P(X = 3) = \frac{e^{-3}*3^{3}}{(3)!} = 0.2240$

$P(1 \leq X \leq 3) = P(X = 1) + P(X = 2) + P(X = 3) = 0.1494 + 0.2240 + 0.2240 = 0.5974$

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3 years ago

Translate this sentence into an algebraic inequality.

SpyIntel [72]

Answer:

y + 4/7 $\geq$ 6x

Step-by-step explanation:

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An online store contacts 1000 customers from its list of customers who have purchased in the last year. In all, 696 of the 1000

Vlad1618 [11]

<u>The population in this setting is(A) All customers who have purchased something in the last year.</u>

<u></u>

Step-by-step explanation:

As it is given in the question that 1000 customers from the list of the customers who made a purchase last year.So the list refers to the population of the people who have made a purchase last year .

The 1000 customers are the sample of the population.

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1. A 2. A 3. A 4. A Kind of odd that they all turn out to A.

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4 years ago

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How do I found a scale factor of a scale copy?

love history [14]

Answer:

first you have to look at one of the sides of the scaled copy. If they are divisible by the numbers in the original shape, then try and see if the others sides of the scaled copy are scaled by the same factor. If they are, then they are a scaled copy.

Step-by-step explanation:

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3 years ago